I have not been able to find any specifications on this Swimmer Delivery Vehicle. Another slightly different type of Swimmer Delivery Vehicle can be found at the AAF Tank Museum in Danville VA. The USS Nautilus Museum in Groton CT has two SDVs, one a flatter much different Swimmer Delivery Vehicle, and an WWII Italian Maiale Minisub. The Maiale Minisub is well documented, but the US SDVs are somewhat of a mystery.